I guess it would be a nickname since someone stated that Voidtrecker Express is its name, but I still think it makes it sound like a delivery company.

As for the reason for the request of couples is simple. It's about intimacy. If they want to be close in that way they have to basically maneuver around Cabinmates, make sure they don't walk in, and all that jazz.

Though if there are exceptions where there are certain things that people need to do alone there are other quiet rooms to claim now, but one of them is simply for that purpose or will be sorted to be that way.